diff --git a/src/libsystemd/sd-netlink/generic-netlink.c b/src/libsystemd/sd-netlink/generic-netlink.c
index 5467f62ffa..32af79f6ae 100644
--- a/src/libsystemd/sd-netlink/generic-netlink.c
+++ b/src/libsystemd/sd-netlink/generic-netlink.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
 #include <linux/genetlink.h>
 
 #include "sd-netlink.h"